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Strict mode in JavaScript programming

By Md Shoriful Islam
Strict mode in JavaScript   Strict mode in JavaScript is a way to enforce stricter rules and restrictions when writing JavaScript code, which can help identify and prevent potential errors, security leaks, or performance issues. It is enabled by adding the following line at the beginning of a script or a function: "use strict"; When strict mode is enabled, the JavaScript interpreter will throw errors or disallow certain actions that are allowed in non-strict mode. Some examples of changes in strict mode include: 1. Variables must be declared with var , let , or const before being used, otherwise an error is thrown. Non-strict mode: x = 10; // No error, even though 'x' is not declared console.log(x); // 10 Strict mode: "use strict"; x = 10; // Error: x is not defined console.log(x); 2. Assigning a value to an undeclared variable, read-only property, or non-writable global variable will throw an error. Non-strict mode: NaN = "not a number"; /
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Way Too Long Words - Codeforces problem solution

By Md Shoriful Islam
 Way Too Long Words - Codeforces problem solution  A. Way Too Long Words Sometimes some words like "localization" or "internationalization" are so long that writing them many times in one text is quite tiresome. Let's consider a word too long, if its length is strictly more than 10 characters. All too long words should be replaced with a special abbreviation. This abbreviation is made like this: we write down the first and the last letter of a word and between them we write the number of letters between the first and the last letters. That number is in decimal system and doesn't contain any leading zeroes. Thus, "localization" will be spelt as "l10n", and "internationalization» will be spelt as "i18n". You are suggested to automatize the process of changing the words with abbreviations. At that all too long words should be replaced by the abbreviation and the words that are not too long should not undergo any changes. Input
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University Questions - 1st semester

By Md Shoriful Islam
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City University, Bangladesh  1st Semester Question Mid-term CSE 111 ENG 101 PHY 101 Final ENG 201 PHY 201 CSE 112
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Location: City University, Bangladesh
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Way Too Long Words - Codeforces problem solution

By Md Shoriful Islam
Way Too Long Words - Codeforces problem solution   A. Way Too Long Words Sometimes some words like " localization " or " internationalization " are so long that writing them many times in one text is quite tiresome. Let's consider a word  too long , if its length is  strictly more  than  10  characters. All too long words should be replaced with a special abbreviation. This abbreviation is made like this: we write down the first and the last letter of a word and between them we write the number of letters between the first and the last letters. That number is in decimal system and doesn't contain any leading zeroes. Thus, " localization " will be spelt as " l10n ", and " internationalization » will be spelt as " i18n ". You are suggested to automatize the process of changing the words with abbreviations. At that all too long words should be replaced by the abbreviation and the words that are not too long should not undergo
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By Md Shoriful Islam
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[GYM] 100 Easy Problems (Bootcamp)

By Md Shoriful Islam
  [GYM] 100 Easy Problems (Bootcamp) Target audience: newbies and pupils (rating up to 1400). Group link:  https://codeforces.com/group/yg7WhsFsAp/contests  (hit "join" on the right). Hi. Enjoy a series of 8 problem lists for beginners. The example topics are strings, arrays, math, and binary search. You are allowed to discuss anything with others, or just look up solutions online. There are also 3 exams, each recommended for a 2-hour individual virtual participation. Use the displayed order, e.g. take exam 1 after day 3. It all should take you 2 weeks of intense bootcamp-like work (or a few months if you take your time). The problems were originally used two years ago in a Saudi Arabia camp. It's a mix of around 70 existing CF problems and 30 new original problems, mainly prepared by  kostka , with some help from me and  mustafabar . I asked them for permission to publish everything. I will put hints to some problems in this blog (or in the group? not sure). Expect a few
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403. Scientific Problem - C++ / C - Solution - Codeforces ACMSGURU problemset

By Md Shoriful Islam
403. Scientific Problem Time limit per test: 0.25 second(s) Memory limit: 65536 kilobytes input: standard output: standard Once upon a time Professor Idioticideasinventor was travelling by train. Watching cheerless landscape outside the window, he decided to invent the theme of his new scientific work. All of a sudden a brilliant idea struck him: to develop an effective algorithm finding an integer number, which is x times less than the sum of all its integer positive predecessors, where number x is given. As far as he has no computer in the train, you have to solve this difficult problem. Input The first line of the input file contains an integer number x (1 ≤ x ≤ 109). OutputOutput an integer number — the answer to the problem. Example(s) sample input sample output 1 3 sample output 2 5 Solution Code: C++ #include <iostream> using namespace std ; // solved int main () { int x ; cin >> x ; cout << 2 * x + 1 << endl ; return 0 ; } Solu
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Version Control with Git: A Beginner’s Guide

By Md Shoriful Islam
Version Control with Git: A Beginner’s Guide If you are a developer, you probably know how important it is to keep track of your code changes and collaborate with other developers on a project. But how do you do that effectively and efficiently? The answer is version control. Version control is a system that records changes to a file or set of files over time so that you can recall specific versions later. It allows you to revert files back to a previous state, compare changes over time, see who last modified something, and more. Version control also enables you to work with other developers on the same code base without stepping on each other’s toes. One of the most popular version control systems in the world is Git. Git is a free and open source distributed version control system that is designed to handle everything from small to very large projects with speed and efficiency. Git has many features that make it superior to other version control systems, such as: Cheap local branchin
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Callback function in JavaScript

By Md Shoriful Islam
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Callback function in JavaScript What is a callback function in JavaScript? A callback function is a function that is passed as an argument to another function and is executed after the first function has completed its task. Callback functions are useful for handling asynchronous events, such as network requests, file operations, or timers. For example, you can use a callback function to display the result of a calculation after the calculation is done. Callback function in JavaScript Here is a simple example of a callback function in JavaScript: // Define a function that takes a callback as an argument function sayHello (callback) { // Do some task console .log ("Hello, world!"); // Invoke the callback function callback (); } // Define another function function sayGoodbye () { // Do some task console .log ("Goodbye, world!"); } // Call the first function and pass the second function as a callback sayHello (sayGoodbye); // The output will be: // Hello, wo
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